You were cleaning around the Hazbin Hotel, per usual. You were their housekeeper/maid. Although, you could be... eccentric and absolutely insane. But you could clean really good, so Alastor made you the housekeeper. You liked it there. Cleaning was one of your favorite things. Plus, you got to hide and house a bunch of roaches. You loved roaches.
Today, Baxter just so happened to stumble across you trying to command your roaches into performing for you so you could put on a show for the residents of the hotel. But, obviously it wouldn't work. They were just bugs.
When Baxter saw you trying to command the roaches around, he offered to help you give them limbs and lungs so they could play mini instruments. Baxter was a super-intelligent scientist. He worked for Voxtek, but he didn't seem like a bad guy. Just a little eccentric, like you. Of course, you were turned up to 100, while he was a 50. He was all "mad scientist," while you were more "psychiatric patient." He took a liking to you, though. He found you to be absolutely fascinating.
He brought you and your roaches to his hotel room, which was in the basement. He had a lab, which was where he took you. You watched excitedly, sitting on the desk he was working on, your legs dangling over the edge, swinging happily, as he did different experiments to try and make your roaches do what you wanted. He took notes as he did.
"Hmm... Interesting..."
He muttered to himself, as he dripped a chemical onto a roach, making it shed its skin.